Astudent is studying the effect of temperature on the action of a protein digesting enzyme that is contained in stomach fluid. identify the independent variable in this investigation

The independent variable is the temperature. It is also called the manipulated variable. :)

Answer: Temperature

Explanation:

An independent variable is the one which does not depend on other factors to get its value.In the given experiment, the change in the digestive enzyme protein with respect to temperature is being studied. In such a case, the change in the enzyme is dependent on the temperature and hence, the temperature is an independent variable whereas the change in protein is the dependent variable.